Error for iconRegistry in Jupyterlab 2.x

Hi Guys,
I am trying to convert a plugin from Jupyterlab 1.x to 2.x. Looking for equivalent library for iconRegistry in JupyterLab 2.x.

You should find all the relevant info there: JupyterLab 1.x to 2.x Extension Migration Guide — JupyterLab 2.2.2 documentation

Thanks @loichuder ,
I have checked the document before and got the info on version change. Currently I am looking at: ui-components | @jupyterlab .
where I am trying to find the methods, interface, etc. that I need to change in code. I guess LabIcon may replace iconRegistry but is there an example of LabIcon that I can refer to or any doc for olde version of ui-components where I can compare iconRegistry with to understand the code changes

This particular part of the documentation which show the difference between 1.x and 2.x may be useful to you then: jupyterlab/packages/ui-components at master · jupyterlab/jupyterlab · GitHub